What is UP for rock climbers hanging upside down,
when they are chatting on their phone,
which points towards the horizon,
whilst they live in Australia? ;)

( @Ian... give in to the temptation... )

Thanks Victor, those are some good notes.
And I guess some of them will take some time to figure out how to handle
them nicely.

1) Ok, right. I'll add that to the list.

That's useful because...
    when you want to keep the length (as a speed),
    but normalize the vector to be used just as a direction.

This would be like normalize_ip in the pygame vector.

'normalize_ip' currently returns None.
So it might be nice to return the length(magnitude) there?

'normalize` returns a copy of the vector.

2) scaling back up from 0 does indeed seem hard.
Would it need to be only after it was scaled down?
Perhaps adding the last value would be useful.
But then, there are many ways a vector can come to be at zero.

3) perhaps some assumption could be used about screen->world coordinates
could be baked in.

Or some property of the vector,
    vec2(0, 1).asGL??? -> vec2(0, -1)

Swizzle convention?
    vec2(0, 1).xY -> vec2(0, -1)

Not sure really.

draw.circle says,
  "Give me the coordinates in pygame screen coordinates? Please." -> (0, 1)

4) oh yes, draw functions. Very good point.

Automatic rounding in the draw functions seem a good idea.
I'll include drawing a circle in my example I'm writing,
and perhaps modernise circle drawing first.

What would a pygame.draw.vector2 look like? draw.vector3?

5) I didn't try benchmarking with pypy.
I expect they'll have similar performance to other pygame C types like Rect.

Not sure if they have optimized keyword arguments(METH_KEYWORDS),
 as much as they have METH_NOARGS and METH_VARARGS.

I'm going to the pypy sprint in Leysin, and should get a benchmark ready by

On Thu, Mar 1, 2018 at 10:17 AM, Ian Mallett <i...@geometrian.com> wrote:

> On Thu, Mar 1, 2018 at 1:43 AM, Greg Ewing <greg.ew...@canterbury.ac.nz>
> wrote:
>> No, no, no. Z points up in real physics!
> Oh, and I expect "j" is the imaginary unit, "Σ"s can be omitted, gravity
> is exactly 10 m/s, without the square, and anyway one can drop units
> whenever one feels like it?
> ( Must. Resist. Temptation. To. Rant. . . )

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